The test tries to verify that Non Invite Client Transactions correctly change
states as specified by the rfc3261. The Tested Implementation is used
to send requests and the ReferenceImplementation issues (or not) corresponding
responses. ClientTransaction states are constantly queried
and compared to those in the state machine described in
section 17.1.2 of rfc3261

Tries to walk a TI client transaction through the following scenario
Trying-->Proceeding-->Completed-->Terminated. Apart from state
transitions, we also test, retransmissions and proper hiding/passing
of messages to the TU.

Tries to walk a TI client transaction through the following scenario
Trying-->Completed-->Terminated. Apart from state
transitions, we also test, retransmissions and proper hiding/passing
of messages to the TU.